add test for detection of head, left, right connections at switches #46
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This adds a test for the calculation of "Anschluss" (head, left, right) of a switch. The test contains some base scenarios (think: a switch rotated in steps of 45°) and therefrom derived scenarios (think: the switch moved around in the coordinate system). The derived scenarios are the ones actually being tested. The test reveals actual defects (probably also #41, not quite sure). Thanks for considering.